Drug interactions
Sepiapterin + Sulphasalazine
Severity: Major
Sepiapterin and Sulphasalazine: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Sulfasalazine inhibits sepiapterin reductase, the enzyme that converts sepiapterin to BH4 in part of the pathway. This can reduce BH4 formation and loss of phenylalanine control.
What this interaction means in plain words
Sepiapterin and Sulphasalazine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Sepiapterin belongs to Miscellaneous; Sulphasalazine belongs to Gastrointestinal Tract.
Why it happens
Inhibition of sepiapterin reductase by sulfasalazine reduces BH4 production.
What to do
Avoid the combination if possible. If unavoidable, monitor blood phenylalanine regularly.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Sepiapterin
- Methotrexate + Sepiapterin Major
- Pemetrexed + Sepiapterin Major
- Levodopa + Sepiapterin Moderate
- Sepiapterin + Sildenafil Moderate
- Sepiapterin + Tadalafil Moderate
- Sepiapterin + Vardenafil Moderate
Other interactions of Sulphasalazine
- Deferiprone + Sulphasalazine Major
- Pexidartinib + Sulphasalazine Major
- Acalabrutinib + Sulphasalazine Moderate
- Aceclofenac + Sulphasalazine Moderate
- Acetazolamide + Sulphasalazine Moderate
- Asciminib + Sulphasalazine Moderate
Frequently asked questions
Can I take Sepiapterin with Sulphasalazine?
MediHelp rates the interaction as major. Sepiapterin and Sulphasalazine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Sulfasalazine inhibits sepiapterin reductase, the enzyme that converts sepiapterin to BH4 in part of the pathway. This can reduce BH4 formation and loss of phenylalanine control.
How serious is the interaction between Sepiapterin and Sulphasalazine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination if possible. If unavoidable, monitor blood phenylalanine regularly.
What other medicines interact with Sepiapterin?
MediHelp also lists interactions of Sepiapterin with, for example, Methotrexate, Pemetrexed, Levodopa. The full list is on the Sepiapterin page.
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